Turn off all window decorations for some windows

I am a long time user of Waimea, an obscure but highly configurable window manager. In waimea, I had it set up to turn off all window manager decorations for some windows. Unfortunately, that wm is dead. Fortunately, xfce4 is a good replacement. I have been able to duplicate *most* of my config from waimea. However, I have been unable to find any docs on more advanced configuration options. Specifically, I want to turn off all window decorations around my editor (gvim) window. Any pointers to doc or help are greatly appreciated.